/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package py.netty.buffer;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.CompositeByteBuf;
import io.netty.util.ResourceLeakTracker;
import io.netty.util.internal.ObjectUtil;
import java.nio.ByteOrder;

class SimpleLeakAwareCompositeByteBuf extends WrappedCompositeByteBuf {
  final ResourceLeakTracker<ByteBuf> leak;

  SimpleLeakAwareCompositeByteBuf(CompositeByteBuf wrapped, ResourceLeakTracker<ByteBuf> leak) {
    super(wrapped);
    this.leak = ObjectUtil.checkNotNull(leak, "leak");
  }

  @Override
  public boolean release() {
    ByteBuf unwrapped = unwrap();
    if (super.release()) {
      closeLeak(unwrapped);
      return true;
    }
    return false;
  }

  @Override
  public boolean release(int decrement) {
    ByteBuf unwrapped = unwrap();
    if (super.release(decrement)) {
      closeLeak(unwrapped);
      return true;
    }
    return false;
  }

  private void closeLeak(ByteBuf trackedByteBuf) {
    boolean closed = leak.close(trackedByteBuf);
    assert closed;
  }

  @Override
  public ByteBuf order(ByteOrder endianness) {
    if (order() == endianness) {
      return this;
    } else {
      return newLeakAwareByteBuf(super.order(endianness));
    }
  }

  @Override
  public ByteBuf slice() {
    return newLeakAwareByteBuf(super.slice());
  }

  @Override
  public ByteBuf slice(int index, int length) {
    return newLeakAwareByteBuf(super.slice(index, length));
  }

  @Override
  public ByteBuf retainedSlice(int index, int length) {
    return newLeakAwareByteBuf(super.retainedSlice(index, length));
  }

  @Override
  public ByteBuf retainedSlice() {
    return newLeakAwareByteBuf(super.retainedSlice());
  }

  @Override
  public ByteBuf duplicate() {
    return newLeakAwareByteBuf(super.duplicate());
  }

  @Override
  public ByteBuf retainedDuplicate() {
    return newLeakAwareByteBuf(super.retainedDuplicate());
  }

  @Override
  public ByteBuf readSlice(int length) {
    return newLeakAwareByteBuf(super.readSlice(length));
  }

  @Override
  public ByteBuf readRetainedSlice(int length) {
    return newLeakAwareByteBuf(super.readRetainedSlice(length));
  }

  @Override
  public ByteBuf asReadOnly() {
    return newLeakAwareByteBuf(super.asReadOnly());
  }

  private SimpleLeakAwareByteBuf newLeakAwareByteBuf(ByteBuf wrapped) {
    return newLeakAwareByteBuf(wrapped, unwrap(), leak);
  }

  protected SimpleLeakAwareByteBuf newLeakAwareByteBuf(
      ByteBuf wrapped, ByteBuf trackedByteBuf, ResourceLeakTracker<ByteBuf> leakTracker) {
    return new SimpleLeakAwareByteBuf(wrapped, trackedByteBuf, leakTracker);
  }
}
